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关于iot:感芯MC3172点亮OLED屏幕

jiezi

前言

感芯科技推出了一款 64 线程的 MCU，此前在感芯科技的公众号申请了一块收费的开发板，进行了简略的评测应用，整体上应用体验良好。首先这款开发板的个性是 64 线程，高实时和高确定性，其线程频率由外部时钟动态片分，换言之就是线程逻辑上独立，实用于高实时的利用场景——它就是MC3172。

根底信息

这块开发板目前曾经调试过 PWM 呼吸灯，UART，SPI，OLED 亮屏等性能，整体上手难度个别，开发板图例如下，更多相干信息请返回文章底部进入开发板官网链接进行查看：

点亮 OLED

本次例程针对 SH1106，这块 OLED 采纳 SPI 协定，屏幕大小为 1.3 英寸，分辨率为 128 * 64。

话不多说，间接上代码：

/*  LED 128*64 7 PINs SPI Protocal Driver
 *   @Date 2022-07-16
 *   @Author Winter
 *   @License Apache Licence 2.0
 */

#include "MC3172.h"

#define OLED_COLUMN_NUMBER 128 // Screen resolution width
#define OLED_ROW_NUMBER 64     // Screen resolution height
#define OLED_COLUMN_OFFSET 2
#define OLED_PAGE_NUMBER OLED_ROW_NUMBER / 8 // how many pages to divide ROW

#define OLED_POS_PORT GPIOC_BASE_ADDR
#define OLED_GPCOM_PORT GPCOM9_BASE_ADDR
#define OLED_GPCOM_TX_RP GPCOM9_TX_RP
#define OLED_GPCOM_TX_WP GPCOM9_TX_WP

static u8 video_buffer[1024]; // Video Memory

// RST(RES): Reset Signal Input, High for normal operation
// Position: PORTC[2]
#define SET_SPI_RST_0 GPIO_SET_OUTPUT_PIN_TO_0(OLED_POS_PORT, (GPIO_PIN2))
#define SET_SPI_RST_1 GPIO_SET_OUTPUT_PIN_TO_1(OLED_POS_PORT, (GPIO_PIN2))

// DC: Data/Command Control
// Position: PORTC[5]
#define SET_SPI_DC_0 GPIO_SET_OUTPUT_PIN_TO_0(OLED_POS_PORT, (GPIO_PIN5))
#define SET_SPI_DC_1 GPIO_SET_OUTPUT_PIN_TO_1(OLED_POS_PORT, (GPIO_PIN5))

// CS: Chip Select
// Position: PORTC[4]
#define SET_SPI_CS_0 GPIO_SET_OUTPUT_PIN_TO_0(OLED_POS_PORT, (GPIO_PIN4))
#define SET_SPI_CS_1 GPIO_SET_OUTPUT_PIN_TO_1(OLED_POS_PORT, (GPIO_PIN4))

// SH1106 commands for SPI
const unsigned char _init_cmd[25] = {
    0xAE, //Set display off

    0xD5, //Set frequency division
    0x80, //[3:0],Set display divide ratio;[7:4],(OSC drequency)

    0xA8, //Set multiplex ratio.
    0X3F, //default is 1/64

    0xD3, //Set display offset
    0X00, //default is 0

    0x40, //set display start line [5:0]

    0x8D, //Set charge pump
    0x14, 

    0x20, //Set address mode
    0x02, //[1:0],00，column first;01，row first;10,page first;default is 10;

    0xA1, //Set segment Re-map,bit0:0,0->0;1,0->127;

    0xC8, //Set COM output scan direction,bit3:0,normal mode;1,redefine mode COM[N-1]->COM0;N:driver channeles (C0 display inverse) C8

    0xDA, //Set COM I/O
    0x12, //[5:4]

    0x81, // Set contrast
    0x66, // Set brightness, 1~255;default is 0X7F

    0xD9, //Set pre-charge period
    0xf1, //[3:0],PHASE 1;[7:4],PHASE 2;

    0xDB, //Set VCOMH deselect level
    0x30, //[6:4] 000,0.65*vcc;001,0.77*vcc;011,0.83*vcc;

    0xA4, //Set entire display on/off ;bit0:1,on;0,off;

    0xA6, //Set display mode;bit0:1,Normal;0,Inverse

    0xAF, //Set display on
};

void _oled_init_io(void)
{// CS:PORTC[4] DC:PORTC[5] RES:PORTC[2] SDA:PORTC[6] SCK:PORTC[7]

    INTDEV_SET_CLK_RST(OLED_POS_PORT, (INTDEV_RUN | INTDEV_IS_GROUP0 | INTDEV_CLK_IS_CORECLK_DIV32)); // 133/32

    GPIO_SET_OUTPUT_EN_VALUE(OLED_POS_PORT, (GPIO_PIN2 | GPIO_PIN3 | GPIO_PIN4 | GPIO_PIN5), GPIO_SET_ENABLE);

    INTDEV_SET_CLK_RST(OLED_GPCOM_PORT, (INTDEV_RUN | INTDEV_IS_GROUP0 | INTDEV_CLK_IS_CORECLK_DIV32));

    GPCOM_SET_OUT_PORT(OLED_GPCOM_PORT, (GPCOM_P0_OUTPUT_DISABLE | GPCOM_P1_OUTPUT_DISABLE | GPCOM_P2_OUTPUT_ENABLE | GPCOM_P2_IS_MASTER_OUT | GPCOM_P3_OUTPUT_ENABLE | GPCOM_P3_IS_MASTER_CLK));

    GPCOM_SET_COM_MODE(OLED_GPCOM_PORT, (GPCOM_SPI_MASTER_MODE0 | GPCOM_TX_MSB_FIRST | GPCOM_RX_MSB_FIRST));

    GPCOM_SET_COM_SPEED(OLED_GPCOM_PORT, 4156250, 1000000);

    GPCOM_SET_OVERRIDE_GPIO(OLED_GPCOM_PORT, (GPCOM_P2_OVERRIDE_GPIO | GPCOM_P3_OVERRIDE_GPIO));
}

void _oled_send_byte(unsigned char byte)
{
    u8 tx_data_wp = 0;
    tx_data_wp = GPCOM_GET_TX_WP(OLED_GPCOM_PORT);

    GPCOM_SEND_TX_DATA(OLED_GPCOM_PORT, tx_data_wp + 0, byte); // Write data to cache 0 buffer.
    tx_data_wp += 1;

    GPCOM_SEND_TX_WP(OLED_GPCOM_PORT, tx_data_wp);

    while (OLED_GPCOM_TX_RP != OLED_GPCOM_TX_WP)
    {// waiting for transmission};

} // SPI_SendByte

void _oled_send_cmd(unsigned char o_command)
{
    SET_SPI_DC_0;
    SET_SPI_CS_0;
    _oled_send_byte(o_command);
    SET_SPI_CS_1;
    // SPI_DC_1;
}
void _oled_send_data(unsigned char o_data)
{
    SET_SPI_DC_1;
    SET_SPI_CS_0;
    _oled_send_byte(o_data);
    SET_SPI_CS_1;
}

void _oled_set_column(unsigned char column)
{
    column += OLED_COLUMN_OFFSET;
    _oled_send_cmd(0x10 | (column >> 4));   //Setting the column higher bits.
    _oled_send_cmd(0x00 | (column & 0x0F)); //Setting the column lower bits.
}

void _oled_set_page(unsigned char page)
{_oled_send_cmd(0xb0 + page);
}

void _oled_clear(void)
{
    unsigned char page, column;
    for (page = 0; page < OLED_PAGE_NUMBER; page++) // page loop
    {_oled_set_page(page);
        _oled_set_column(0);
        for (column = 0; column < OLED_COLUMN_NUMBER; column++) // column loop
        {_oled_send_data(0x00);
        }
    }
}
void _oled_fullfilled(void)
{
    unsigned char page, column;
    for (page = 0; page < OLED_PAGE_NUMBER; page++) // page loop
    {_oled_set_page(page);
        _oled_set_column(0);
        for (column = 0; column < OLED_COLUMN_NUMBER; column++) // column loop
        {_oled_send_data(0xff);
        }
    }
}

void _oled_init_cmds(void)
{
    unsigned char i;
    for (i = 0; i < 25; i++)
    {_oled_send_cmd(_init_cmd[i]);
    }
}

void _frame_refresh(const unsigned char *ptr_pic)
{
    unsigned char page, column;
    for (page = 0; page < (OLED_ROW_NUMBER / 8); page++) // page loop
    {_oled_set_page(page);
        _oled_set_column(0);
        for (column = 0; column < OLED_COLUMN_NUMBER; column++) // column loop
        {_oled_send_data(*ptr_pic++);
        }
    }
}

void _frame_refresh_inverse(const unsigned char *ptr_pic)
{
    unsigned char page, column, data;
    for (page = 0; page < (OLED_ROW_NUMBER / 8); page++) // page loop
    {_oled_set_page(page);
        _oled_set_column(0);
        for (column = 0; column < OLED_COLUMN_NUMBER; column++) // column loop
        {
            data = *ptr_pic++;
            data = ~data;
            _oled_send_data(data);
        }
    }
}

int oled_init(void)
{_oled_init_io();
    SET_SPI_RST_0;
    delay_ms(500);
    SET_SPI_RST_1;
    delay_ms(500);
    _oled_init_cmds();
    _oled_fullfilled();
    delay_ms(500);
    _oled_clear();}

void oled_refresh()
{_frame_refresh(&video_buffer[0]);
}

// Inverse the bit value for each pixel.
void oled_refresh_inverse()
{_frame_refresh_inverse(&video_buffer[0]);
}

在以上的代码中 video_buffer 为屏幕展现的内容，在此处提供一个内容帧用于验证参考：

//replace vide_buffer with below:
static u8 video_buffer[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,24,8,56,248,96,0,0,0,0,0,0,0,0,0,0,128,128,192,64,64,64,96,32,32,32,32,96,64,64,64,192,128,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,64,32,48,16,8,12,4,4,6,6,2,2,2,2,2,2,2,4,4,4,4,4,12,8,12,15,11,8,8,8,8,8,12,4,2,2,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,2,6,4,12,16,48,96,192,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,248,14,3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,192,224,240,224,0,0,0,0,0,0,0,0,0,128,96,32,0,0,0,0,0,0,192,128,224,76,246,112,244,200,200,240,240,112,144,32,0,0,0,0,0,1,6,56,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,192,224,32,32,255,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,15,15,0,0,0,0,0,0,224,28,3,0,0,0,0,192,224,48,250,63,239,247,187,217,239,255,123,28,7,11,1,2,0,0,0,0,0,0,0,0,0,224,63,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,255,176,240,255,240,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,128,96,30,3,0,0,0,0,0,1,6,8,24,48,32,33,33,99,67,67,67,67,131,131,129,128,128,128,128,64,64,64,64,96,32,32,32,48,24,12,7,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,3,7,6,3,6,12,8,8,24,16,48,32,32,32,96,64,64,64,64,64,64,192,128,192,192,96,96,80,88,68,70,65,65,64,64,64,64,64,192,128,0,0,0,0,0,0,192,32,24,4,2,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,192,224,240,172,131,160,192,128,192,192,254,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,96,48,24,8,12,14,1,0,0,0,0,0,0,0,0,7,62,112,32,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};

在代码中嵌入该帧内容，运行后你将会取得一个外星人版本的史努比！！！

扩大

笔者在以上根底上进行了扩大，实现了随画随显性能，成果如下图，有趣味应用该开发板的网友能够尝试更多有意思的创意和体验。

结语

支付开发板至今大略有一个月工夫，笔者在工作之余去体验了该开发板，最大的体验是多线程的无感调度（硬件实现），应用该个性能够实现更多须要高独立性高实时性的利用，一起期待更多有意思的创意吧！

更多内容相干

官网代码仓库：gxchip (gitee.com)，官网：感芯科技

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